Navigation Radio Operation Tips - keywords accessory audio cd clock disc dvd error inoperative low navigation onstar speaker volume U3U UVB

This PI was superseded to update models and model years. Please discard PIT3911A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customers may comment about one or more of the following navigation (U3U) and (UVB) radio concerns:

1. Low volume from either the radio and/or OnStar systems. (This Applies to the 2007 U3U navigation radio only)
2. Radio displays "Map Disk Error" when trying to operate navigation portion of radio.
3. Clock will not update itself when the vehicle enters new time zones.

Please read the following to address the concerns listed above.

1. If the customer experiences low volume from the radio and/or the OnStar system, have the dealer reprogram the navigation radio with the latest calibration available in TIS2000 version 2.75 or later. (This applies to model year 2007 only and only the U3U navigation radio)
2. Radio displays "Map Disk Error", this concern may be caused by operator error, make sure the Map disk is installed in the correct slot, located behind the navigation screen. To access this slot, you will need to go to the Navigation menu and select the load Map CD button. You can find the exact instructions and location of the slot in the navigation supplement owner's manual.
3. "Clock will not update in new time zone" This is normal operation and the radio should not be replaced for this concern. Refer customers to the navigation supplement owner's manual regarding this feature which provides the instructions on how to manually change the clock settings.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.